public class Example12_1 {
   public  static void main(String args[]) {
       SpeakElephant  speakElephant;
       SpeakCar  speakCar;
       speakElephant = new SpeakElephant() ;
       speakCar = new SpeakCar();
       speakElephant.start();
       speakCar.start();
       for(int i=1;i<=15;i++) {
          System.out.print("host"+i+"  ");
       }
   }
}
